Charles a



Patented lan'. 3.1899.

C. A. WRIGHT.

PUMP

(Application filed June 16, 1896.)

I mm

(No Model.)

Invenor.

W tnesses.

Attorney.

ATE

rricni PUMP.

SPECIFICATION formig part of Letters Patent NO. 617,212, dated January 3, 1899.'

Application filed June 16,1896. Serial Ne. 595,760. (No model.)

To all whom, it mc concrm Be it known that I, CHARLES A. lVRIGHLof the city and county of Philadelphia and State of Pennsylvania, have invented an Improvement in Pumps, of which the following is a specification.

My invention has reference to pumps and it consists of certain improvements,which are fully set forth in the following specification and shown in the accompanying drawings, which form a part thereof.

The object of my invention is to provide a mechanical construction of pump especially adapted to pumpvolatle liquids under high pressure, such as is necessary in vaporlaunches or machinery employing volatile vapor as the source of power.

IIeretofore dficulty has been experienced from the fact that the stuffing-boxes of pumps employed for this purpose have been on the pressure side of the piston, and consequently it was difficult to secure the pump against leakage of the liquid. Where water is the fluid to be vaporized, this loss is of no moment; but when alcohol or highly-volatile spirits are employed it is a matter of the greatest importance, as the same fluid is continuously used over and over again, and none of it must be permitted to escape.

In carrying out my invention I provide a pump-chamber and pump-piston and necessary valves so as to be single-acting, and arrange the Operating parts for the piston within the pump-chamber and upon the sucton side, so that the rock-shaft thereof and its stuffingbox shall also open or extendinto the suctionchamber of the pump.

My nvention will be better understood by reference to the accompanying drawings, in which- Fgure 1 is a sectional elevation of my improved pump, taken on line w x of Fig. 3. Fig. 2 is a side elevation of my improved pump, and Fig. 3 is a plan View of same.

A is the cylinder of the pump, and opens at the bottom into the suction or inlet chamber B, into which the liquid is supplied by the suction-pipe O. The piston C moves in cylinder A and is connected to a rocking arm E by a link F. The rocking armE is arranged within the inlet-chamber B and secured to the shaft D, journaled in the said inletchamber, and one end of said shaft is extended to the outside of the chamber and packed by the stuffing-box P. This rockshaft D has secured upon its outer end an arm or lever Q, which is pulled upward by the spring T and downward by an eccentric R and rod S. This latter action is secured by having the rod S fit loosely through a hole in the arm or lever Q and provided with a collar s at the top, which catches upon the lever to force it down. In the upstroke of the rod S 'the collar s may leavethe lever O and the spring T be alone relied upon for pulling the said arm or lever O upward. In this manner the suction action of the piston is positively produced by the eccentric but the forcing or pressure action of the piston is controlled by the spring T, and hence is always constant. This method of Operating the rock-shaft is of course not essential, but is that which I eommonly employ. It is of course evident that the piston-rod of the piston might pass directly through a stuffing-box, as usual, but I prefer to use the rock-shaft shown in this application, because the bearings are more durable and it is easier to make a tight joint at the stufflng-boxes than where the shaft reciprocates.

The cylinder of the punp also contains parallel to it a suction-port or passage-way Gr, opening at the bottom into the inlet-chanber B and provided at the top with a check-valve H. The upper end of the cylinder is covered With a cap I, which is recessed on the bottom to form a chamber J ,which incloses the checkvalve H and opens into the top of the cylinder A. The chamber J communicates through a port with the discharge -chamber K, arranged in the upper part of the cap I, and this port is provided with a check-valve `L. A screw-plug M is fitted to the upper end of the cap, so as to tightly close the compartment K and yet permit at any time access to .be had on the valve L. Opening from the chamber K on the side of the cap I is the discharge-pipe N.

It will now be observed that upon the descent of the piston C the liquid will be drawn through the pipe O into the chamber B and pass upward through port G and into the cylinder A by flowing under the valve H and through the chamber J. Upon the return stroke of the piston the liquid is forced up IOO ward under the valve L into the dischargechamber K and thence through the pipe N. In addition to this action the upward move ment of the piston C creates a suction upon the inlet-chamber B, and hence draws in from the suction-pipe O an additional supply of liquid. It Will thus be seen' that the descent of the piston O canses a flow of the liquid from the inlet-chamber into the upper part of the cylinder and then in its upWard stroke discharges the said liquid through the dischargepipe N. In this latter action the additional liquid necessary to keep the pump filled is draWn in through the suction-pipe O. It is quite evident that on starting the pump the suction created by the piston alone Will cause the flow of the liquid through the supply-pipe 0 and put the pump into operative condition.

That I claim as new, and desire to secure by Letters Patent, is-- In a pump, the combination of the cylnderbody formed With the long cylinder A and long parallel tubular passage-Way G and an inlet-chamber at the bottom into which said oylinder and passage-Way open, a head detachably secured to the top of the cylinder-body and formed With a shallow clearance on its under side connecting with the cylinder unobstructedly and also with the tubular passage- Way to form a suction-chamber and further having a discharge-chanber upon its upper part connected With the suction-chamber by a valved passage-Way provided With a lateral discharge-port, a screw-plug M tting into the top of the discharge-chanber to seal it and hold the valve in place, a piston in the cylinder, a valve in the tubularpassage-Way held in Working position by the upper Wall of the suction-chamber, a rock-shaft extending into the inlet-chamber, and connecting means between the rock-shaft and piston.

Intestinony of which invention I hereunto set my hand.

CHARLES A. WRIGIIT. lVitnesses:

ANDREW ZANE, WM. L. EvANs. 

